Undefined function sha256()

The Suhosin extension adds the function sha256(), and even sha256_file(), to the PHP Core.

With the extension installed:

<?php
var_dump(function_exists('sha256'));
?>

bool(true)

There is no such function in php standard library. Use hash function instead. http://php.net/manual/en/function.hash.php like :

$pass = hash('sha256', $_POST['password']);

You can use

hash( 'sha256', $string );

See http://de.php.net/manual/de/function.hash.php

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